AIR SPRING & STRUT ASSY; Ram 1500; Left. AIR SPRING & STRUT ASSY; Ram 1500; Left; Code ZAJ. A shock absorber is a device that controls the spring oscillations when the vehicle goes over various road irregularities, so the vehicle's tires remain in contact with the road. In some cases, shock absorbers have a secondary function as a suspension limiter to prevent the suspension from either over-extending and/or over-compressing. Air Suspension. Air Suspension Spring. Suspension Code:ZAJ. Absorber.